Malou, a prostitute from Montmartre, and her pimp, have found a well laid scheme : whenever she (or he) wants to get rid of a lover, she announces to him in a tearful voice that she is pregnant. The reaction of the fall guy-is invariable: he gives her compensation money and disappears. But there is always an exception to the rule. And, as it happens, the exception is a widowed insurer, Monsieur Archibald. Indeed when he is told by Malou that he is going to be a father, he is...elated!

While Henri Laurent speeds along on the racing circuits, his pretty wife Françoise goes from luxury boutique to luxury boutique with her best friend Denise. One day, Denise lets her know that Henri has a lover. Outraged, Françoise moves out of marital home and rents a maids' room in Rue de l'Estrapade. Henri tries to get his wife back but Françoise does not listen. She even looks for a job in a prêt-à-porter shop and lets herself be courted by Robert, her neighbor across the landing...

Bitru is a carefree fellow who, one day, decides to buy a houseboat on the River Seine. He moves there and starts living surrounded by a circle of colorful friends. Among them, the daughter of an auto maker but also a group of scientists who have developed "Aqua Simplex", a device that could enable motorists to fill their tanks with... water ! Panic sets in in the automobile industry and Bitru is appointed his friends' middle man to represent them on the various car makers directors' boards.

Germain, a great seducer, collects the mistresses. There are four, all brown, and all married. When the husband of one of them disembarks to threaten him with death, he must break up. But with which? The gouailleur Robert Lamoureux interprets this man who does not like to leave women.

Spies pursue a stolen diary aboard the Orient Express.

In an isolated house, in Brittany, live two sisters around whom gravitate a whole series of strange characters. Between the eruption of the vagrant voyeur and that of the couple in love, the youngest kills her eldest and goes mad.

To spice up a life that's too quiet, a couple of friends play at being gangsters, but end up meeting some real hoodlums.